Please, please, please tell me that Deck-O-Seal is much darker before it cures. The builder sent his guy out to do the mastic between the coping on the deck today. When I came out to look after work it looks black. Not gray ... black. They never asked me to specify a color for the mastic, and they never specified one either. Frankly, it never occurred to me that anybody might use anything other than white for white coping with white grout. I'm really praying this stuff will turn color or something. It's been about 5 hours and it's still black.